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Marketable Securities - Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 890,307 |
Gross Unrealized Losses, less than 12 months | (8,330) | [1]
Gross Unrealized Losses, 12 months or more | 7,900 |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 497,833 |
Gross Unrealized Losses, less than 12 months | (4,702) | [1]
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 211,588 |
Gross Unrealized Losses, less than 12 months | (2,094) | [1]
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 169,967 |
Gross Unrealized Losses, less than 12 months | (1,445) | [1]
Sovereign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 10,919 |
Gross Unrealized Losses, less than 12 months | $ (89) | [1]
[1] | As of December 31, 2018, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was $7.9 million.

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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